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// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package cluster_disk

import (
	"github.com/elastic/beats/libbeat/common"
	"github.com/elastic/beats/libbeat/common/cfgwarn"
	"github.com/elastic/beats/metricbeat/helper"
	"github.com/elastic/beats/metricbeat/mb"
	"github.com/elastic/beats/metricbeat/mb/parse"
)

const (
	defaultScheme = "http"
	defaultPath   = "/api/v0.1/df"
)

var (
	hostParser = parse.URLHostParserBuilder{
		DefaultScheme: defaultScheme,
		DefaultPath:   defaultPath,
	}.Build()
)

func init() {
	mb.Registry.MustAddMetricSet("ceph", "cluster_disk", New,
		mb.WithHostParser(hostParser),
		mb.DefaultMetricSet(),
	)
}

type MetricSet struct {
	mb.BaseMetricSet
	*helper.HTTP
}

func New(base mb.BaseMetricSet) (mb.MetricSet, error) {
	cfgwarn.Beta("The ceph cluster_disk metricset is beta")

	http, err := helper.NewHTTP(base)
	if err != nil {
		return nil, err
	}
	http.SetHeader("Accept", "application/json")

	return &MetricSet{
		base,
		http,
	}, nil
}

func (m *MetricSet) Fetch() (common.MapStr, error) {
	content, err := m.HTTP.FetchContent()

	if err != nil {
		return nil, err
	}

	return eventMapping(content), nil
}
